White lines and unresponsive touch on iPhone 6, what should I do?

Hi, i recently dropped my iPhone 6 and white lines showed up on about 1/5 of the display. To add to the problem, I can't touch in the white lines area. I understand the white lines is probably a bad digitizer, but what about the inability to touch and use that area? I was thinking that it may be a connection issue inside and I though I might open it up and take a look. any ideas?